OVERVIEW: Infrared Line Scanner (IRLS) is a passive infrared sensor system that scans a linear field of view to detect and track heat-emitting targets, widely used from the 1970s onward for surveillance and targeting.

GENERAL DESCRIPTION: Infrared Line Scanners use a scanning mechanism to sweep a narrow infrared sensor across a scene line-by-line, producing a thermal image based on emitted infrared radiation. These systems provide continuous, real-time detection of heat signatures such as vehicles, aircraft, or personnel, and are commonly integrated into airborne, naval, and ground platforms. IRLS devices operate in the mid-wave infrared (MWIR) or long-wave infrared (LWIR) bands, enabling detection in various environmental conditions including low light and obscurants.

ROLE SUMMARY:
Category: Infrared Sensor / Surveillance
Primary Use: Passive thermal imaging and target detection
Function: Line-by-line infrared scanning generating thermal images
Platform: Aircraft, helicopters, naval vessels, ground vehicles
Integration: Works with fire control, reconnaissance, and navigation systems

See Specific information under [Sensors/EW] section.

SOURCE:
Defense Industry Technical Papers
https://en.wikipedia.org/wiki/Infrared_scanner